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Convertible Preferred Stock and Stockholders' Deficit - Summary of Outstanding Common Stock Warrants (Details) shares in Thousands | 9 Months Ended
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Sep. 30, 2018 $ / shares shares
Class Of Warrant Or Right [Line Items] |
Warrants Outstanding | 105
Exercise Price $19.55 |
Class Of Warrant Or Right [Line Items] |
Warrants Outstanding | 14
Exercise Price | $ / shares | $ 19.55
Expiration Date | 2022-12
Exercise Price $9.73 |
Class Of Warrant Or Right [Line Items] |
Warrants Outstanding | 30
Exercise Price | $ / shares | $ 9.73
Expiration Date | 2021-02
Exercise Price $9.73 |
Class Of Warrant Or Right [Line Items] |
Warrants Outstanding | 20
Exercise Price | $ / shares | $ 9.73
Expiration Date | 2023-08
Exercise Price $9.73 |
Class Of Warrant Or Right [Line Items] |
Warrants Outstanding | 20
Exercise Price | $ / shares | $ 9.73
Expiration Date | 2024-03
Exercise Price $9.73 |
Class Of Warrant Or Right [Line Items] |
Warrants Outstanding | 21
Exercise Price | $ / shares | $ 9.73
Expiration Date | 2024-12

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